My iPad 33 cm (13-inch) M2 fitted perfectly when naked. However, I use it for more than on stage and therefore have a dropsafe case on it. With that mounted it doesn't fit anymore so I'll continue with a note stand for the iPad.
Otherwise quite sturdy plastics, but I would have preferred some kind of case to store it in while jumping between gigs. Some of these plastic arms will sooner or later get a beating and I'm there without a holder.